Grenvillian remnants in the Northern Andes: Rodinian and Phanerozoic paleogeographic perspectives

A. Cardona, D. Chew, V. A. Valencia, G. Bayona, A. Mišković, M. Ibañez-Mejía

Research output: Contribution to journalArticlepeer-review

78 Scopus citations

Abstract

Grenvillian crust is encountered in several basement inliers in the northern Andes of Colombia, Ecuador and Peru and is also represented as a major detrital or inherited component within Neoproterozoic to Paleozoic sedimentary and magmatic rocks. This review of the tectonic and geochronological record of the Grenvillian belt in the northern Andes suggests that these crustal segments probably formed on an active continental margin in which associated arc and back-arc magmatism evolved from ca. 1.25 to 1.16 Ga, possibly extending to as young as 1.08 Ga. The lithostratigraphic and tectonic history of the Grenvillian belt in the northern Andes differs from that of the Sunsas belt on the southwest Amazonian Craton and from the Grenvillian belt of Eastern Laurentia. It is considered that this belt, along with similar terranes of Grenvillian age in Middle America and Mexico define a separate composite orogen which formed on the northwestern margin of the Amazonian Craton. Microcontinent accretion and interaction with the Sveconorwegian province on Baltica is a feasible tectonic scenario, in line with recent paleogeographic reconstructions of the Rodinian supercontinent. Although Phanerozoic tectonics may have redistributed some of these terranes, they are still viewed as para-autocthonous domains that remained in proximity to the margin of Amazonia. Paleogeographic data derived from Phanerozoic rocks suggest that some of the Colombian Grenvillian fragments were connected to northernmost Peru and Ecuador until the Mesozoic, whereas the Mexican terranes where attached to the Colombian margin until Pangea fragmentation in Late Triassic times.

Original languageEnglish (US)
Pages (from-to)92-104
Number of pages13
JournalJournal of South American Earth Sciences
Volume29
Issue number1
DOIs
StatePublished - Jan 2010
Externally publishedYes

Keywords

  • Grenville
  • Northern Andes
  • Paleogeography
  • Terrane dispersion

ASJC Scopus subject areas

  • Geology
  • Earth-Surface Processes

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